In order to minimize the effects of a tender vessel, when carrying a cargo of lumber, you should（）. ["maximum your deck load","distribute lumber so that those stowing most compactly per until of weight are in the upper hilds","place the heaviest woods in the lower holds","keep the vessel's frame spaces free from lumber"]
影响保险供给的因素主要包括（）方面。 ["保险供给主体","保险市场环境","保险监管","保险意识"]
城市里的生活垃圾应该（）。 ["放置于指定地点","随意倾倒","随意抛撒","随意堆放"]
有人说，垃圾是放错位置的资源。我们应该采取措施提高生活垃圾的（）。 ["产生量","价格","利用率","质量"]
机械大开挖的工程，合同既没有约定，甲方也没有特殊要求，施工单位采取了挡土墙及砂袋护坡，是否应计入结算造价？
矿用叶轮式浮选机工作原理是什么？
